Power-hammer



(No Model.) 2 Sheets- Sheet 1.

A. BEAUDRVY. POWER HAMMER.

No. 487,692. Patented Dec. 6, 1892.

IIIIIIIIII Il Il FTTH WITNESSESI (No Model.) 2 Sheets-Sheet 2.

A. BEAUDRY.

- POWER HAMMER.

No. 487,692. Patented Dec. 6, 1892.

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INVENTQR;

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ALEXANDER BEAUDRY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BEAUDRYTOOL COMPANY, OF PORTLAND, MAINE.

POWER-HAMMER.

SPECIFICATIGN forming part of Letters Patent No. 487,692, dated December6, 1892.

Application filed February 8, 1 8 92.

To all whom iff/may concern.-

Be it known that I, ALEXANDER BEAUDRY, a citizen of the United States,and a resident of Boston, Suffolk county, Massachusetts, have inventedcertain Improvements in Power- Hammers, of which` the following is aspecilication. v My invention relates to improvements in power-hammershaving facilities for varying the force of the blow to suit the work inhand; and its object is to produce a cheap and eflicient hammer of thisclass which will occupy a limited space and have good weariu gqualities.

My invention will be fully described hereinafter, and its novel featurescarefully defined in the claims.

In the accompanying drawings, which serve to illustrate my invention,Figure l is a sectional side elevation of the hammer, the hammer-framebeing substantially in mid-section at its upper part to better disclosethe mechanism which actuates the hammer-head. The upper part of thehammer-head is also in section. mer. Fig. 3 is a plan of the hammer.Fig. 4. is a sectional detail view of the crank wheel and pin.

The frame A of the hammer is constructed, by preference, of cast-iron,and` it may be made in one piece or integral.

A is the portion of the frame in which the anvil Bis mounted, and A2 isthe overhanging portion of the frame in which the hammer-head C plays upand down over the anvil in suitable guides. The other or main part ofthe frame is substantially hollow, and in this hollow is mounted themechanism by which the proper motion is imparted to the hammer-head.

D is the main shaft, mounted at the base portion of frame A in a bracketA3 thereon, and E is a driving-pulley keyed on the said shaft.

On the shaft D, within the hollow of the frame A, is a crank-wheel F,from which a reciprocating movement is imparted to the hammer-headthrough the medium of mechanism I will now describe. G is an upper linkpivotally mounted at g in the frame on a transverse pin, and G is asimilar lower Fig. 2 is a rear elevation of the ham-v Serial No.420,635. (No model.)

ythe free end of the link Gand at itslower end Ato the free end of linkG. The lower link is coupled to the crank-pin fof the crank-wheel 3F bya connecting-rod I. Thus when the main shaft is rotated the rod Iimparts a vibrating up-and-down motion to the tie-barH. J is the hammerarm or helve. This arm plays in an aperture in the front of the mainframe, and its front endj, which is flattened and has a centralaperture, enters a hollow in the hammer-head C, where it is embracedfrom above and below by rubber cushions c c in the hollow of the hammerand held in place by a pin c', preferably of hard wood, which passesdown through holes in the hammer-head, in the cushions c c, and in theend of the helve. At its other or rear end the helve has a T-shaped headj', which is parti-circular or convex where it bears on the frontupright face of the tie-bar H, and is provided at the two eX- tremitieswith eyes or pairs of apertured lugs, whereby it is loosely coupledbypins [i2 to two eyebolts h h, which play'loosely through apertures inthe tie-bar H and have nuts and washers on their rear ends back of thebar H. On each eyebolt h, between the bar II and the nut or washer onthe eyebolt, is a rubber cushion h. Preferably I provide the bar H withrecesses in its rear face to receive the cushions 71 and provide eacheyebolt with cup-washer h2 to take over the outer end of the cushion andreceive the chaling and wear from the nut h3 on the bolt. By tighteningup the nuts the desired tension of the cushions h may be attained. Thenthe shaft- D is set in motion, the tie-bar H receives a rapidup-and-down reciprocating movement, modied by the swing of the links Gand G about their pivots. This variation from the vertical by the bar Has it moves to and fro is irnparted to the hammer-belve J, and themovements of this helve will be further modified by the cushions h atthe back of bar H and IOO the cushions in the hollow of the hammerhead.The convex face of the head .7 of the helve rolls or rocks (more orless) on the face of the bar H during the operations of the hammer, thusovercoming to some extent the inertia ot the hammer-head at thebeginning of the return stroke by the resiliency of the cushions h'. Torelieve the lateral (vertical) strain on the eyebolts which secure thehelve to the bar H, I prefer to pass a stud through the bar H from theback about midway between the eyebolts and allow its rounded end toloosely engage a corresponding recess in the convex face of the head ,7"of the helve. This pin takes the weight of the parts to some degree oitfrom the eyebolts.

To counterbalance the weight of the hammer head and helve and put themechanism more nearly in equilibrium, I provide a counter-spring. To arear prolongation of the link G', back of the pivot g', I couple aspringcasing L. (Represented as partly broken away in Fig. l.) In thiscasing is placed a spiral spring M, through which passes a spring-rod N,which is adjustably coupled at its lower extremity to a bracket n on theframe A. At

its upper or inner end this rod N has a head y n', which takes over theupper end of the compression-sprin g M. A nut n2 on the lower end of therod N allows the spring to be put under any tension desired. By thuscounterbalancing the head ofthe hammer I avoid the use of a [1y-wheeland am enabled to stop the hammer almost instantly by means of a brake.I employ, by preference, an ordinary treadle-brake, the shoe of whichbears 011 the broader face of the pulley-rim; but I have not deemed itnecessary to illustrate the brake in the drawings, as it posseses nonovel features. The counterbalancing-spring may be of rubber, as it is acompression-spring, and the amount of compression during the descent ofthe hammer will not usually be more than five-eights of an inch. Thepart A' of the frame in which the anvil is set may, and preferably will,be cast separately from the main portion A and be bolted orscrewedfirmly thereto. The hammer-head C is prevented from turning axially inits guides, it being c) lindrical in form, by means of a grooveextending longitudinally of the head and a spline m, (seen in Fig. 3,)which engages ihe groove in the hammer-head and a groove or keyway inthe part A2 of the frame in which the hammer-head is mounted. The splinem is held in place by a suitable screw or screws o.

Cushion-springs of wireorof metal and rubber combined may be employed inlieu of the rubber springs shown. It will be obvious,

also, that an eccentric for operating the hammer may be employed in lieuof the crank described.

As herein shown, the crank-pin fis in the form of a stud projecting froma dovetail blockf', which is mounted in a radial dovetail groove in theface of the crank-wheel F and has a nut and washer on its outer end. Onthe crank pin is the sleeve f2, which is clamped endwise between theface of the wheel F and the nut. This serves to clamp the block f'wherever it may be set. The end of the connecting-rod I turns about thesleeve f2. This construction enables the throw of the crank to be variedwithin limits by merely loosening the nut f3 on the crank-pin andshifting the block f'. Fig. 4 is a sectional view, which clearlyillustrates this construction.

Having thus described my invention, I claiml. In a power-hammer, thecombination, with a frame, a hammerhead mounted to play in guides, and amain power-shaft, and crank, of the links G G', pivotally mounted in theframe, the tie-bar H, coupled at itsrespective ends to the free ends ofsaid links, the connecting-rod which couples one of said links to thecrank, and the helve J, having a cushioned connection with thehammer-head at one end and a cushioned connection with vthe tie-bar H atits other end.

2. In a power-hammer, the combination, with a frame, a hammer-headmounted to play in guides therein, a power-shaft, and a crank on saidshaft, of the upper link G,piv otally mounted at its front end in saidframe, the lower link G', pivotally mounted at its rear end in saidframe, the upright tie-bar H, coupled at its respective ends to the freeends of said links, the connecting-rod which couples the crank to thelower link G', the helve J, having its front end embraced betweencushions in the hollow of the hammer-head, the said cushions, thetiebolts which connect the convex T-shaped head of the helve to the barH, the cushions on said tie-bolts, and the counter-spring for the hammerhead and helve.

3. In a power-hammer, the combination, with a frame, a hammer-head whichis mounted in vertical guides therein, an upright bar H, connected tothe frame by links, the said links, and means for imparting to said baran up-and-down motion, of a helve J, provided with a convex T-shapedrear end having apertures at its extremity, eye/bolts which couple thehelve to the bar H and hold it firmly up thereto, the elastic cushionson said eyebolts, the stud 7c in the bar H, which engages a recess inthe convex face of the helve, the cushions in the hollow of thehammer-head and embracing the end of the helve, and the pin whichcouples together the helve, hammerhead, and cushions.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

ALEXANDER BEAUDRY.

Witnesses:

HENRY CoNNnrr, PETER A. Ross.

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